Simple subtraction that I can't figure out.

Question

A bat and a ball cost £1.10 in total. The bat costs £1 more than the ball. How much does the ball cost?

The answer to this question is somehow 5p. How?!! Should it not be 10p?

Answer 1

Let's call the cost of the ball $x$. The bat costs $1$ more than the ball so it is $x+1$. Together, they cost $1.1$ so: $$x+(x+1)=1.1$$ $$2x+1=1.1$$ $$\therefore\:x=\frac{1.1-1}{2}=0.05$$ Which gives you the $5p$. Hope I helped.

Note: I've ignored $£$ & $p$ so they don't get in the way; assume that $£1=1$.

Answer 2

Hint:

Let $x$ be the price of the ball (in pence), so $100+x$ is the price of the bat (also in pence). Then:

$$x + (100+x) = 110$$

What is $x$?